In the present work, turbulence in high Rayleigh number two-dimensional confined free convection is modelled by two k-eps formulations, the one proposed for the Workshop, and the other previously employed by the authors. Results are presented for a suare cavity with Prandtl number of 0.71 and Rayleigh number ranging from 10^10 to 10^12. Also, numerical results and experimental measurements are compared for a 10:1 height-to-width aspect ratio cavity filled with water, and Rayleigh number of 8x10^10. From the comparisons performed it is apparent that k-eps modelling in free convection, although yielding acceptable predictions for several quantities, tends to overestimate the heat transfer rate.
Contribution to the Numerical Simulation of Turbulent Natural Convection in Rectangular Enclosures
NOBILE, ENRICO;
1993-01-01
Abstract
In the present work, turbulence in high Rayleigh number two-dimensional confined free convection is modelled by two k-eps formulations, the one proposed for the Workshop, and the other previously employed by the authors. Results are presented for a suare cavity with Prandtl number of 0.71 and Rayleigh number ranging from 10^10 to 10^12. Also, numerical results and experimental measurements are compared for a 10:1 height-to-width aspect ratio cavity filled with water, and Rayleigh number of 8x10^10. From the comparisons performed it is apparent that k-eps modelling in free convection, although yielding acceptable predictions for several quantities, tends to overestimate the heat transfer rate.Pubblicazioni consigliate
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